Quicksand

quick sandquicksandssand in water
Quicksand is a colloid consisting of fine granular material (such as sand, silt or clay), and water.wikipedia
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Soil liquefaction

liquefactionliquefyliquefied
Liquefaction is a special case of quicksand.
Examples of soil liquefaction include quicksand, quick clay, turbidity currents and earthquake-induced liquefaction.

Sand

sand grainsandybeach sand
Quicksand is a colloid consisting of fine granular material (such as sand, silt or clay), and water.
In areas of high pore water pressure, sand and salt water can form quicksand, which is a colloid hydrogel that behaves like a liquid.

Non-Newtonian fluid

non-Newtoniannon-Newtonian flowoobleck
Quicksand is a shear thinning non-Newtonian fluid: when undisturbed, it often appears to be solid ("gel" form), but a less than 1% change in the stress on the quicksand will cause a sudden decrease in its viscosity ("sol" form).

Effective stress

effective forces
In the case of upwards flowing water, forces oppose the force of gravity and suspend the soil particles.
Two extremes of this effect are quicksand, where the groundwater gradient and seepage force act against gravity; and the "sandcastle effect", where the water drainage and capillary action act to strengthen the sand.

Dry quicksand

dry sandpitquicksand
It acts similarly to normal quicksand, but it does not contain any water and does not operate on the same principle.

Grain entrapment

sinks into the corn and nearly suffocatessinks into the grainsuffocates as he sinks into the grain
It has been likened to concrete, cement or quicksand; and described as making it impossible to even wiggle toes inside a shoe or boot; one survivor said he felt as if an "80000 lb semi truck had parked on [his] chest."

Colloid

colloidscolloidalcolloid chemistry
Quicksand is a colloid consisting of fine granular material (such as sand, silt or clay), and water.

Granular material

granulesgranulargranular flow
Quicksand is a colloid consisting of fine granular material (such as sand, silt or clay), and water.

Silt

siltysilt depositdesilted
Quicksand is a colloid consisting of fine granular material (such as sand, silt or clay), and water.

Clay

claysblue clayammonia-rich clays
Quicksand is a colloid consisting of fine granular material (such as sand, silt or clay), and water.

Water

H 2 OHOliquid water
Quicksand is a colloid consisting of fine granular material (such as sand, silt or clay), and water.

Artesian aquifer

artesian wellartesianartesian wells
Quicksand can form in standing water or in upwards flowing water (as from an artesian spring).

Earthquake

earthquakesseismic activityseismic
In this case, sudden earthquake forces immediately increase the pore pressure of shallow groundwater.

Pore water pressure

pore pressurepore fluid pressurepore pressures
In this case, sudden earthquake forces immediately increase the pore pressure of shallow groundwater.

Shear thinning

pseudoplasticshear-thinningpseudoplastic fluids
Quicksand is a shear thinning non-Newtonian fluid: when undisturbed, it often appears to be solid ("gel" form), but a less than 1% change in the stress on the quicksand will cause a sudden decrease in its viscosity ("sol" form).

Phase (matter)

phasephasesgas phase
Quicksand is a shear thinning non-Newtonian fluid: when undisturbed, it often appears to be solid ("gel" form), but a less than 1% change in the stress on the quicksand will cause a sudden decrease in its viscosity ("sol" form).

Gel

hydrogelsgelsjelly
Quicksand is a shear thinning non-Newtonian fluid: when undisturbed, it often appears to be solid ("gel" form), but a less than 1% change in the stress on the quicksand will cause a sudden decrease in its viscosity ("sol" form).

Stress (mechanics)

stressstressestensile stress
Quicksand is a shear thinning non-Newtonian fluid: when undisturbed, it often appears to be solid ("gel" form), but a less than 1% change in the stress on the quicksand will cause a sudden decrease in its viscosity ("sol" form).

Viscosity

viscouskinematic viscositydynamic viscosity
Quicksand is a shear thinning non-Newtonian fluid: when undisturbed, it often appears to be solid ("gel" form), but a less than 1% change in the stress on the quicksand will cause a sudden decrease in its viscosity ("sol" form).

Sol (colloid)

solsolscolloidal sol
Quicksand is a shear thinning non-Newtonian fluid: when undisturbed, it often appears to be solid ("gel" form), but a less than 1% change in the stress on the quicksand will cause a sudden decrease in its viscosity ("sol" form).

Sediment

sedimentslake sedimentdregs
After an initial disturbance—such as a person attempting to walk on it—the water and sand in the quicksand separate and dense regions of sand sediment form; it is because of the formation of these high volume fraction regions that the viscosity of the quicksand seems to decrease suddenly.

Volume fraction

volume percentv/vpercentage by volume
After an initial disturbance—such as a person attempting to walk on it—the water and sand in the quicksand separate and dense regions of sand sediment form; it is because of the formation of these high volume fraction regions that the viscosity of the quicksand seems to decrease suddenly.

Pressure

water pressurenegative pressurefluid pressure
To move within the quicksand, a person or object must apply sufficient pressure on the compacted sand to re-introduce enough water to liquefy it.

Liquefaction

liquefyliquefiedliquification
To move within the quicksand, a person or object must apply sufficient pressure on the compacted sand to re-introduce enough water to liquefy it.